Citation: ZENG Yong-Ping, ZHU Xiao-Min, YANG Zheng-Hua. Car-Parrinello Molecular Dynamics Simulations of Microstructure Properties of Liquid Water, Methanol and Ethanol[J]. Acta Physico-Chimica Sinica, ;2011, 27(12): 2779-2785. doi: 10.3866/PKU.WHXB20112779 shu

Car-Parrinello Molecular Dynamics Simulations of Microstructure Properties of Liquid Water, Methanol and Ethanol

1.
College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, Jiangsu Province, P. R. China

Received Date: 2 August 2011
Available Online: 6 September 2011
Fund Project: 国家自然科学基金(20806064)资助项目 (20806064)

Car-Parrinello molecular dynamics (CPMD) calculations were performed on the solvent structure properties of water, methanol, and ethanol. The results show that the first O…O peaks of the radial distribution functions (RDFs) in the three systems are 0.278 nm for water, 0.276 nm for methanol, and 0.275 nm for ethanol. The first O…H peaks of the radial distribution functions (RDFs) in the three systems are at 0.178 nm for water, 0.176 nm for methanol, and 0.177 nm for ethanol. This indicates that the hydrophobic groupings (hydrogen, methyl, and ethyl) have little influence on the first peak position. However, the intensity of the RDFs increases from water to methanol and ethanol. The spatial distribution functions show that the oxygen and hydrogen atoms of other solvent molecules have characteristic orientations on the reference molecules in these systems. The results are in agreement with the first sharp peak of the radial distribution functions. We analyzed the hydrogen bonds using a statistical method. The results show that the average hydrogen bond numbers are 3.62 for water, 1.99 for methanol, and 1.87 for ethanol. Therefore, different hydrogen-bonded network structures are formed for liquid water, methanol, and ethanol via hydrogen bonds.
- Water,
- Methanol,
- Ethanol,
- CPMD,
- Microstructure
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